Atomic structure
Name: _______________________________________
1. What does the word neutral mean? ________________________________________________
Give an example of something that is neutral: ____________________________________________
2. What does it mean to be electrically neutral? _________________________________________
Give an example of something that is electrically neutral: ___________________________________
Facts:
a) Atoms are electrically neutral
b) Protons are positive
c) Electrons are negative
3. What must a neutral atom contain and why?
4. Draw a neutral atom :
Fact: The number of protons identifies the element
5. What element did you create? How do you know?
6. What is meant by mass?
Fact: The mass of an atom is made up of protons and neutrons.
7. Create an atom with a mass of 14. What atom did you create and how do you know?
Fact: Only protons and neutrons are in the nucleus.
8. What are two more facts that you can state about electrons?
Facts: 1)
2)
18.998
Atomic mass
F
Atomic symbol
9
Atomic number
1)
2)
3)
4)
Rounds to mass # = protons + neutrons
= number of protons
What is the mass number for fluorine? ______
How many protons does fluorine have? ______
How many neutrons does fluorine have? _____
How many electrons does fluorine have? _____
Build a fluorine atom using the paper plate as the nucleus – copy it below.
Fact: Isotopes are neutral atoms that have the same atomic number but a different number
of neutrons.
1.
Build two isotopes of fluorine – what is the only difference between the two?
2. Carbon-14 (146C) is a radioactive isotope that is commonly found in living beings. It is Carbon with a mass
number of 14. Build a carbon-14 atom – identify the number of protons, neutrons and electrons – put your
information below.
#protons = _____
#neutrons= _____
# electrons = _____
Facts:
1) Ions are not neutral
2) Cations are positive ions
3) Anions are negative ions
1. Build a phosphorus ion that has a negative three charge :
P3-